Meanest nastiest killer of a wet pet

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My new 3" Congo puffer bite chunks out of fish it can't swallow.
 
I genuinely think my betta is insane, he is flared up 95% of the time, and eerily seems to know when people are looking at him.

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Chicxulub said:
Source?
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Bull sharks have been caught deep into freshwater lakes, they have also been recorded breeding, or atleast giving birth in freshwater. Whether there is a population that lives permanently in fw, im not sure, but i would bet on it with the large amount of prey and lack of competion makes freshwater rivers a good place for a maniac bullshark. But on topic id have to go with the convict as one on the meanest fish pound for pound.

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Thing is they thought those in lake Nicaragua were 100% freshwater but then they caught one that was tagged there welll offshore..
 
I wouldn't be surprised if they spent long amounts of time there, months, but I'm not convinced that any will live their entire lives in fw. Scientists should tag a pup caught in fw or a few and see if they ever leave for their entire lives


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The probably swim into freshwater in the dry season so the fish are more concentrated.but when food runs low the can head back to sw. Thats what makes bullsharks so kicka**, they can get you anywhere!

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